/Engine/Source/Runtime/Slate/Public/Framework/MultiBox/MultiBoxBuilder.h
Adds a combo button
void AddComboButton ( const [FUIAction](API\Runtime\Slate\Framework\Commands\FUIAction) & InAction, const FOnGetContent & InMenuContentGenerator, const [TAttribute](API\Runtime\Core\Misc\TAttribute)< [FText](API\Runtime\Core\Internationalization\FText) > & InLabelOverride, const [TAttribute](API\Runtime\Core\Misc\TAttribute)< [FText](API\Runtime\Core\Internationalization\FText) > & InToolTipOverride, const [TAttribute](API\Runtime\Core\Misc\TAttribute)< [FSlateIcon](API\Runtime\SlateCore\Textures\FSlateIcon) > & InIconOverride, bool bInSimpleComboBox, [FName](API\Runtime\Core\UObject\FName) InTutorialHighlightName )